摘要
盾构管片的破损极有可能引起渗漏水,会直接影响隧道的正常运营,甚至缩短其使用寿命。基于某越江盾构隧道施工期间近500环盾构管片破损现象,对破损位置及数量进行统计分析,研究管片破损原因,并提出相应改进措施。分析得出管片破损主要是由密封垫闭合压缩力过大导致接缝处应力集中引起,对比了不同密封垫截面面积,密封垫闭合压缩力的变化情况,并提出了防止管片破碎的具体方案。研究表明施工期管片破损原因主要为管片间密封垫参数设计不当。并对密封垫参数进行了优化,改变了密封垫硬度,将密封垫邵尔A硬度从68降低到63;改变了密封垫截面面积,将密封垫截面面积从600.14 mm^(2)降低到553.44 mm^(2),进而降低了密封垫闭合压缩力,将密封垫闭合压缩力从127.47 kN/m降低到82.80 kN/m。对密封垫设计参数进行优化后,盾构管片破损现场得以遏制,研究成果可为类似盾构隧道管片密封垫设计提供借鉴。
The damage of shield tunnel segments can cause leakage,which may impair the serviceability of the metro system,even shorten the tunnel service life.Based on the cracking phenomenon of nearly 500 rings of shield segments during the construction of a shield tunnel across the river,the damage position and quantity is analyzed,the causes of the damage of the segments are discussed,and the corresponding measures are proposed.The damage of segments mainly results from the sealing gasket,by stress concentration due to excessive sealing compression force of the seal gasket.The cross-sectional area of different gaskets and the change of sealing compression force are compared,and the concrete scheme to prevent the segment from breaking is put forward.The results show that the major reason of the damage is improper design of gasket parameters.The gasket parameters are optimized.The seal pad hardness was changed,and the hardness of the seal gasket was reduced from 68 to 63.The area of the seal gasket section was also changed,and the seal gasket section area was reduced from 600.14 mm^(2)to 553.44 mm^(2).Therefore,the sealing compression force of the seal gasket was reduced from 127.47 kN/m to 82.8 kN/m.With the optimization of gasket design parameters,damage of shield tunnel segments could be under controlled.The research results can provide reference for similar shield tunnel gasket design.
作者
耿翱鹏
李雪
周顺华
刘建国
Geng Aopeng;Li Xue;Zhou Shunhua;Liu Jianguo(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,P.R.China;Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S01期326-331,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(51808469,52078213)
上海市轨道交通结构耐久与系统安全重点实验室开放基金(R201902)
关键词
盾构隧道
密封垫
管片破损
闭合压缩力
shield tunnel
sealing gasket
segment damage
compression force
